From: Tasuka Amano Hsu (tasuka@mac.com)
Date: Mon Nov 17 2003 - 03:24:12 GMT-3
Thanks Bob,
But if I disallow the VLAN 1, then the VTP still passthrough or not ?
I mean if disallow the VLAN, and native to other vlan, then the VTP
traffics will still at VLAN 1 or will change to native VLAN ?
Sincerely,
Tasuka
Begin forwarded message:
> Tasuka,
>
> Looks to me like instruction 1 is pointing to VTP pruning.
>
> I think these instructions are telling us to allow only the listed
> vlans
> across the link. The 3550 will allow you to remove vlan 1 from a
> trunk, so
> I would do that and make another vlan native. CDP and VTP will come
> out
> with vlan 1 tags, but no other vlan 1 traffic will be seen.
>
> I guess #3 is talking about UDLD? Maybe someone else can help on this?
>
> Good catch on the "vlan dot1q tag native " command.
>
>
> Hope that helps,
>
> -Bob Sinclair
> CCIE #10427, CISSP, MCSE
> bsin@cox.net
>
>
> ----- Original Message -----
> From: "Tasuka Amano Hsu" <tasuka@mac.com>
> To: "ccielab Groupstudy" <ccielab@groupstudy.com>
> Sent: Friday, November 14, 2003 11:25 AM
> Subject: 3550 Switch VLAN native ?
>
>
>> Hi, my english not very well, so I need to make sure the I am
>> understand what it said:
>>
>> 1.If a downstream switch does not process a port in a VLAN that your
>> switch is advertising, you are responsible for making sure that your
>> switch does not propagate broadcast traffic for those VLANs.
>>
>> 2.Create VLANs 10,20,30,40,55,70 and 100. Name each VLAN; VLAN_A,
>> VLAN_B. etc.
>>
>> 3.Configure the two interfaces connecting the 3550's to appear as 1
>> link to STP, If either of the interface is damaged, both switches
>> should actively manage one-way links.
>>
>> 5.This link should allow all VLANs to travel across with their VLAN ID
>> in tact. You can not use Cisco Proprietary protocol to archive this.
>> Every packet that traverses the link must have the VLAN ID, no
>> exceptions.
>>
>> 6.Only allow the defined VLANs across this link.
>>
>> So I will configure a port group with a 802.1q trunk mode and make
>> sure
>> that link has a native VLAN tag for un-tag traffic packets, but does
>> that mean I can use VLAN 1 ? or VLAN 10 as the native VLAN. and just
>> allow the define VLAN traffic passthrough the switch, does it need
>> include VLAN 1 ?
>>
>>
>> Sincerely,
>> Tasuka
>>
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